by Daniel Bennett on 18.11.2022

The Best Payout Slots Offers at UK Online Casinos

Slots are the most popular form of casino game at online sites because they’re easy to get to grips with: just find your favourite, spin the reels, and hope you luck’s in. 

For those looking for slots with a high return to player (RTP) percentage, we’ve compiled a list of the best payout slots on the market. On this page we’ve also explained precisely what defines a high-paying slot, and how players can recognise them so that they can quickly find the slot that’s right for you at the best online casinos.

Slots are one of the most renowned casino games, but which casinos offer the highest payout rates and best casino bonuses? Read on to find out what to look for when searching for the best payout slots at top-rated UK casino sites.

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RTP in Slot Games

RTP refers to the percentage of money a casino expects to return to players on one particular game on average. For example, if a slot has an RTP of 97%, the casino will pay back £97 on average for every £100 wagered. However, be aware that RTP percentages are never calculated using solo or combined play sessions; instead, they’re the summations of massive aggregates of data over an extended period of time. It may take hundreds or thousands of spins, games, or hands before a casino game reaches its advertised RTP.

Generally speaking, choosing a slot with a high payout percentage is a good idea for players on smaller budgets, because they’ll find wins more frequently. Most online slots have RTPs of 94% to 96% ‒ any game with a higher percentage than 97% exists in the top RTP bracket. RTP rates are not always permanently fixed; for some slots, the rate will vary depending on the amount wagered. Several titles require players to wager the maximum amount per spin to activate the highest possible RTP.

RTP is a common metric of online slots. When it comes to selecting the best slot sites for winning, it’s a good idea to check the RTP and variance rating before spinning the reels. Casinos registered in the UK are legally required to display this information next to their games, making it easy to determine which ones offer the highest RTP rates. 

Pros and Cons of Playing High RTP Slots

High RTP slots offer plenty of advantages to players, but there are a few drawbacks to consider too. Below, we run through some of the pros and cons of spinning the reels of the best paying online slots.  

Advantages & Disadvantages of Playing High RTP Slots

Here are some of the things we think you’ll enjoy when you play high payout slots online & some of the drawbacks to playing the best payout online slots:

plus What we like

  • Better returns – The biggest advantage of playing high RTP slots over games with lower payout percentages is related to how much cash you can expect to get back. While there’s no guarantee of landing big wins when you play the best payout slots online, high RTP slots will generally pay out more than lower RTP slots over time. This starts to matter if you enjoy playing the same slot for long periods. 

  • Exciting features – High RTP slots often come packed with extra features that can help make gameplay more exciting. These might be perks like win multipliers, mystery prizes and bonus rounds. Pragmatic Play’s The Catfather slot, which has an RTP of 98.1%, offers a good example. This high RTP slot has a fantastic free spins feature that multiplies winnings by four. 

  • Unique opportunity available online – There’s a lot to be said for playing the most popular slots online, not least because you’ll often find that high RTP slot games are uniquely available at online casinos. Brick-and-mortar casinos have much higher overheads to deal with, so you will often find the house edge is higher and potential payouts are lower when you play land-based slot machines. 

  • Profit from casino bonus offers – Many online casinos welcome new players by boosting their starting bankroll with a matched deposit bonus, such as 100% up to £50. While wagering requirements often apply to bonus cash, these casino welcome offers can give you the edge for a short time, and therefore, a chance to turn a profit by playing high RTP slots with free casino bonus funds — theoretically at least. 

minus What we don't like

  • Less important for casual players – It’s not usually unwise to pick a high RTP slot over a lower paying game, but if you enjoy playing a variety of different slots, the RTP rate for individual games will likely have minimal impact on your choice of game. If you are a casual player simply hoping to hit a lucky spin, you may be more attracted by things like a game’s theme, aesthetics or jackpot size.

  • May contribute less to bonus wagering – casino bonus offers often give you the theoretical chance to make a profit, but this doesn’t always hold true. Some casinos apply game weighting to high paying games, which reduce the contributions they offer toward rollover requirements. You might, for example, see your stakes on high payout slots reduced to 95% of their value. Remember to check any T&Cs carefully. 

  • Less choice of games – The average online slots payout rate sits at around 96-97%. This means that while high RTP slots come in various themes and offer a range of extra perks, the number of best payout slot games will be smaller than the selection of average payout slots available to you. Of course, that’s not to say you won’t find your perfect match — you’ll just have a slightly smaller pool to pick from. 

  • Volatility matters – Some slots players can get caught up in playing games just because they offer a high RTP, losing sight of the fact that the volatility of games also matters. It’s important to consider RTP and volatility in unison. A slot with a high RTP and high volatility is unlikely to suit a player with a small bankroll, as it will only usually be players with bigger budgets who can cover the stakes required on the way to a win. 

House Edge Explained

House edge refers to a casino game’s mathematical advantage over the player. Gamblers can perform well or poorly in practically any game, but they can maximise their chances of winning by optimising their gameplay and therefore reducing the house edge. 

All casino games are built with an inherent house edge to ensure the casino always makes money. It’s important to remember that these casinos are businesses after all, and operate in a way that generates as much revenue as possible. House edge can be seen as an inversion of RTP: if the RTP is 96%, then the house edge is 4%. 

Variance in Slots

Alongside RTP, variance, or volatility, is another critical metric of online slots. If RTP rates were absolute, there’d be no point in playing any casino game, since the outcome would already be decided. It’s the game’s variance that makes casino games worth playing, causing fluctuations in payout rates that allow for the possibility of bigger wins, but also bigger losses. 

Variance is a term that can be used to describe the size and frequency of payouts. Low variance slots will payout minor amounts frequently, while high variance slots payout less frequently but are more likely to pay out large amounts when they do.

These high variance titles may be considered the best slot games for individuals with bigger bankrolls; on the other hand, low volatility games are popular with players on smaller budgets. Because most progressive slots have a high variance, you’re likely to wait longer for a win than you would with other, lower variance games.

What to Look for in the Best Payout Slot Games

Here are some of the things to look for when searching for the best payout slots at UK online casinos:

  • UK Gambling Commission Licence – A casino that doesn’t hold a UKGC licence isn’t permitted to operate in the UK. As such, we only recommend UKGC-licensed casinos to our UK users. 
  • Check the RTP – RTP is a solid indicator of a slot’s payout potential, but remember that payouts can deviate massively from the advertised percentage.
  • Check the payment methods – Confirm if the casino accepts your preferred deposit and withdrawal methods.
  • Bonuses and Promotions – You’ll want to be blessed with a great welcome bonus when you sign-up, and enjoy access to ongoing promotions as an existing member.
  • Pick a Variance – it’s important for there to be a good mix of volatility in online slots games to ensure all players can select the level that suits both their own style of play, and gambling budget. As detailed above, low volatility games are better suited to players on smaller budgets as they’re more likely to pay out small amounts regularly, whereas high rollers tend to opt for high variance games that drop larger winnings over longer stretches of time.

Ways to Win in the Best Payout Slots

Optimising your chances of winning on the slots will largely depend on how you make use of the game’s special features. Paylines, multipliers, and bonus rounds are often crucial here ‒ we’ve broken these down below and have explained how they can affect payout rates.


A payline is a route across the reels that results in a win. Original mechanical slots featured just a single payline that paid out when players hit three identical symbols on a horizontal line. Nowadays, you can play slot games with millions of active paylines that cover various patterns. For some slots, you can decide how many paylines you’d like to make active. 


Multipliers can appear in either the regular game or the slot’s bonus round, boosting winnings by 2x, 3x, 5x, and more. Some slots also feature picking bonus games, which often reveal multipliers at bigger rates.

Bonus Rounds

Numerous slots boost a player’s chances of winning by including bonus rounds. Multipliers, Bonus Spins, expanded wilds, expanding symbols, and other exceptional payoff opportunities may be included in bonus rounds, which often take place in a different location to the base game.

Cluster Pays

Typically a win on the best payout slots comes from correctly matching a row of symbols, but with a cluster pay the symbols only need to be touching one of their four sides. The way in which they’re grouped doesn’t matter, it’s the clustering together that counts. 

Avalanche Reels

Avalanche is a mechanic first launched by NetEnt, with other developers often referring to it as a cascading reel. Following a win, the winning symbols disappear and an “avalanche” of symbols falls from above to replace them, meaning you have an extra chance to win without having to spin again.

Best Payout Slots

The best payout slots casinos have many games on offer. We’ve put together a list of some of the best payout slots with the highest RTPs around

As mentioned earlier, the RTPs published by game developers are theoretical maximums, so the RTP you personally experience may vary during gameplay. Some games require the player to meet certain conditions for the max RTP; be sure to check the game’s help if you’re in any doubt. 

Ugga Bugga98.74–99.07%Low
Mega Joker99%High
Ooh Aah Dracula96–99%Medium
Ocean Princess94.9–99%Low
1429 Uncharted Seas98.5%Low
Blood Suckers98%Low
Rainbow Riches Reels of Gold94–98%Medium
Steam Tower97.04%Medium
Immortal Romance96.86%High


Ugga Bugga – 98.74–99.07%

Playtech’s Ugga Bugga clocks in at the top of the list, with a whopping maximum RTP of 99.07%. While the title is lacking in bonus features, it does offer some unique gameplay. There are three reels, 10 rows, 10 paylines, and players have the ability to hold reels too. 

Wilds are included and players can win up to 1,000x their stake. The game’s high RTP makes it one of the best payout slots online. Although the zany jungle graphics might polarise players, there’s no doubt Ugga Bugga is worth a look if you prefer slots with lower volatility. 

Mega Joker – 99%

Another hard hitter when it comes to RTP is Mega Joker from NetEnt, a high variance slot that emulates the look of classic fruit machines. The three reels, three rows and five paylines make this a simpler slot, but it’s the only one on the list to include a progressive jackpot. 

There are no wilds or scatters to be found here, but there are two bonus modes, Supermeter and Gamble. Often found on older slots, the Gamble mode allows players to bet on the outcome of a card turn.

Supermeter is played on the top set of reels. Once unlocked with a winning combination, players can enjoy all five paylines, higher maximum bets, multiple wins on a single line, and mystery wins when the joker shows up on the reels. Keep in mind you can’t win the jackpot while in Supermeter mode, and only when playing at the max bet level.

Ooh Aah Dracula – 96–99%

Don’t let its quirky appearance deceive you, because Ooh Ahh Dracula from Barcrest means serious business, especially when it comes to bonus features. Players who match three scatter symbols can net 15 free spins and activate the Heart Attack bonus. 

Subsequently matching another four scatters starts Stake It or Leave It, another free spins round where players are granted more free spins and the potential for lucrative rewards, aided by the introduction of wild symbols. 

There’s also the High Roller bonus which yields further free spins or activates the Graveyard Bonus to multiply any free spin winnings. The RTP is bumped up to 99% in this mode too. With so many different mechanics, this 10 payline, 5×3 slot is a great option for players who prefer medium volatility and a more strategic style of play. 

Ocean Princess – 94.9–99%

Ocean Princess is a three-reel, five-row slot from Playtech. There are only five paylines here, but the base RTP of 94.9% is cranked up to 99% with the max bet amount. 

A mechanic seen in other Playtech titles is the Hold feature. Players can hold a particular symbol in a reel after the initial spin, then spin the other two reels again to determine the outcome. 

Although there are no free spins or scatters, there are wild symbols. Match three in your line and you’ll bag 1,000x your wager. Ocean Princess isn’t the most exciting slot out there, but some players will enjoy its undersea theme and low volatility. 

1429 Uncharted Seas – 98.5%

Not only does 1429 Uncharted Seas rank high with an RTP of 98.5%, it’s one of the most beautiful games on the list. The five reels and three rows are presented with hand-drawn seafaring graphics, and there are 25 paylines in total on this low variance slot. 

The bonus features are simple, with expanding wilds to facilitate wins and free spins rounds activated by landing three scatter symbols. Check out this slot from Thunderkick if you’re looking for an immersive and atmospheric experience.

Blood Suckers – 98%

This vampire-themed slot from NetEnt was released in 2013. It combines a 5×3 layout and 25 paylines with wilds and scatters, the latter of which trigger up to 30 free spins. There’s a fun vampire slaying bonus game resulting in extra wins, too. Players can enjoy an impressive 98% RTP and a low variance with this spooky slot.

Jokerizer – 98%

Yggdrasil’s Jokerizer isn’t trying to stand out from the crowd with its familiar fruit machine graphics and simple format. There are five reels, three rows, and 10 betlines on this slot of high volatility, along with a hefty 98% RTP. 

In the absence of wilds or a jackpot, there is the optional Jokerizer mode in which landing two joker symbols awards the player with a mystery prize. There are no free spins unfortunately, but the game is a visual treat with a vibrant and detailed interface. 

Rainbow Riches Reels of Gold – 94–98%

The Rainbow Riches series from Barcrest is themed around treasure and Irish luck, and 2016’s Reels of Gold instalment is no different. This spin-off is much like the original, with a major difference: the addition of Colossal Reels. 

Players are presented with two sets of reels rather than one, combining 5×4 and 12×4 grids with up to 100 paylines total. RTP and paylines are variable in this slot of medium volatility. A higher spend per spin unlocks more paylines and boosts the RTP from 94% to 98%.

Collect three scatters and players enter the bonus round for chances of winning free spins. There are stacked and expanding wilds, and multipliers too. Throw in the randomly triggered Fairy bonus which unlocks even more features, and you can see why some players find Reels of Gold so exciting.

Steam Tower – 97.04%

Perhaps best-known for Starburst, NetEnt brought Victorians and the 19th Century onto the slots scene with their Steam Tower title in 2015. The high RTP and medium variance makes this slot a great all-rounder. It provides a reasonable payout frequency without sacrificing the possibility of high payouts. 

Steam Tower is mostly standard fare when it comes to features. It’s a five-reel, three-row slot with 15 bet lines and the inclusion of stacked wilds. As players climb the eponymous steam tower to rescue the princess, multipliers and free bonus spins are unlocked. 

Immortal Romance – 96.86%

The hugely popular Immortal Romance was debuted by Microgaming at the end of 2011, offering players 243 ways to win across a 5×3 grid. This is a slot with a respectable RTP of 96.86%. It’s highly volatile due to the two bonus rounds, Wild Desire and Chamber of Spins.

The 243-ways format means traditional paylines are out the window, and all 243 pay ways are active at once. You can secure a payout from at least two identical symbols landing on consecutive reels. 

The inclusion of wilds, scatters, achievements, and a host of bonus mechanics make this a slot with a surprising amount of depth, especially if you’re a fan of an engrossing storyline featuring witches and vampires. 

Mega Joker – 99% RTP

While NetEnt slots frequently appear on this page, none come close to this one in terms of RTP. Set at a staggering 99%, it’s no surprise that this classic slot remains popular despite being over a decade old. There are no noteworthy bonus features here and, since it’s made in the classic tradition, the graphics are rather simple. Nevertheless, the combination of high RTP, and a random jackpot is a sure winner for players who want to play straightforward slots at online casinos. 

Book of 99 – 99% RTP

As the title implies, Book of 99 boasts as astounding RTP of 99%. This excellent slot game from Relax Gaming features ten fixed paylines, a grid of five reels and three rows, and has a high volatility ranking. Book of 99 includes a wild book symbol but, unlike most slots, the wild book symbol also serves as the key to triggering bonus spins in this game. Players will receive ten bonus spins if they land at least three wilds. Additionally, for each wild symbol that appears, the meter increases by one, and players will win bonus spins when the meter reaches 99. Bet stakes range from £0.10 to £100 in this game. 

Monopoly Big Event – 96% – 99% RTP

With an RTP reaching 99%, Monopoly Big Event takes the classic board game and converts it into one of the world’s best payout slots. With a big bet bonus round, you can play five spins at a higher RTP in this Barcrest title. Other features include bonus spins, progressive multipliers, epic spins, wild reels, and locked wilds. You can play for as little as £0.20 per spin, or as much as £500 per spin. Keep in mind that the base game has a starting RTP of 96%, but if you play the big bets game bonus this rises to 99%. 

1429 Uncharted Seas – 98.6% RTP

1429 Uncharted Seas is one of Thunderkick’s best slots. This five-reel, 25-fixed payline slot was released in 2014, and is still a popular choice at online casinos because of its high RTP and excellent graphics. Depending on the size of their bankroll, players can wager as little as £0.10 every spin to as much as £100. Symbols like mermaids, dragons, and ships will appear on the reels while you play. Players can also trigger a bonus spins round where they can be awarded with up to 50 additional spins. 

Blood Suckers – 98% RTP

If you’re looking for a high RTP slot with a frightening theme, then look no further than NetEnt’s Blood Suckers. Vampires, cloves of garlic, and potions are just some of the eerie symbols you’ll find on the reels of this slot, played at £0.25 to £50 per spin. Players can win ten bonus spins when spinning the reels of this spooky slot, and it’s here where you’re most likely to find the biggest wins. 

Slots with the Biggest Jackpots

If in search for the online slot with the biggest jackpot then most people head straight to the progressive jackpot slots; a hugely popular option due to the chance of winning big from a reasonably low wager. But to ensure we’re all on the same page here, when we speak of biggest jackpots, we aren’t looking at high or even average RTP slots, nor those with a favourable volatility. In fact many of the biggest jackpots won via online slots have low RTPs, which are known for their large, one off payouts. 

Progressive jackpots, by the very nature of the game, roll an accumulative total before one lucky winner takes the goods. To add bulk to the winning total, some operators participate in pooled jackpots where multiple operators gather entrants together to create the highest jackpot possible. 

But please be mindful that winning the biggest jackpots is something of a rarity, akin to winning the lottery, and not everyone is going to hit the big time like in 2021 when someone won $23.6m on Mega Moolah Absolootly Mad. So always stay within your budget, and take note of average winnings as well as top level situations.

Here’s a few of the biggest jackpots found amongst the best payout slots. 

Mega Moolah

Mega Moolah is the go-to example of big jackpots. It stands as a perfect example of what we mean by high jackpot but low RTP, holding a pretty unencouraging 88.12% RTP. If you consider that 95%-97% is generally considered average, you might wonder why people want to play it at all. The reason people still flock to Microgaming’s Mega Moolah is because it has previously hit the headlines for paying out huge jackpots of over £1m. The progressive jackpot starts out at £1m, steadily increasing with each spin that’s made. The original Mega Moolah remains hugely popular, however there are now a range of versions, such as Mega Moolah Isis, Mega Moolah 5 Wheel Drive, and Mega Moolah Summertime, so choose your theme and see where it takes you!   

MegaJackpots Cleopatra

From the name, it’s clear that this jackpot game’s theme is that of ancient Egypt, following the style of IGTs popular Cleopatra slot. The biggest wins come from symbols such as the Lotus Carving, the Scarab, and Eye of the Horus, with lower wins coming from number and letter symbols, from A and to 9. To win the jackpot, a player must gain five Wild symbols in the centre row of each reel. Initially, holding an RTP of just 88.98%, you won’t find it to be a regularly paying game. However, when it does, it’s an impressive amount, with the MegaJackpot progressive averaging around £900,000. Stakes range from £0.20 to £600, with the jackpot total showing on the sideline as a reminder of what level it’s reached and what you could potentially get your hands on. 


Playtech’s Gladiator is another progressive slots game that averages €956,360 per jackpot win, which is historically won around every 14 weeks. Its biggest win to date was just over €3.1m, and the smallest standing at €147,359.

The game follows the same route as the regular version, except of course for the progressive accumulation of the jackpot which starts at €50,000 and very often tips over the €1,000,000 mark. The jackpot bonus itself is triggered once you land three gladiator helmet symbols on a single spin in the middle three reels. Different-coloured helmets are picked at random, with a selection of nine gold helmets meaning you’ve won the progressive jackpot. Again, this is not a high RTP slot title, standing at a lower than average, 91.5%.

Mega Fortune

Any roundup of the best paying online slots must surely include NetEnt’s Mega Fortune. This progressive jackpot slot packs a punch with a 96.6% RTP, low volatility and oodles of fantastic features. To land a payout in the base game, you’ll need to match wealth-themed symbols, such as wads of cash, fancy rings and swanky limousines. Boat wilds help you along the way, as do the champagne scatters which offer a reward of up to ten free spins and a 5x multiplier. It’s the bonus wheel symbols that you really want to see appear, though. Landing three of these anywhere on the reel launches the bonus game. Here, you’ll have a chance to win one of three jackpots — Rapid, Major and Mega. Each prize kicks off a different value, with the Mega jackpot starting at £150,000 and rising to potentially millions of pounds. 

Age of the Gods

Playtech’s original Age of the Gods slot landed on our screens in 2016, proving an immediate hit thanks to its intriguing Ancient Greek theme, exciting bonus games and bounty of four progressive jackpots. You don’t need to do anything special to be in with a chance of scooping a big win, as any spin on the main game can trigger the jackpot round. Essentially, this is a mini game where you’re guaranteed to win either the Power, Extra Power, Super Power or Ultimate Power Jackpot. These jackpot prizes are pooled between other Age of the Gods titles, such as Age of the Gods Mighty Midas and Age of the Gods King of Olympus, so there are some decent wins involved. The Ultimate Power jackpot, for example, seeds at £100,000, though the average payout tends to be a little under half a million. The RTP for Age of the Gods stands at 95.02%. 

Mega Glam Life

A 2016 release with an RTP of 96.29%, BetSoft’s Mega Glam Life plunges players into the world of the rich and famous, where fast cars, gleaming yachts and chilled champagne reign supreme. This 3D video slot is packed with features like sticky wilds and scatter pays, along with a free spins mode. Set on a tropical island, the max number of spins up for grabs in this bonus game is 16. Of course, the real fun starts when you enter the game’s money wheel bonus round, and you can do this by hitting three or more wheel of fortune bonus symbols on reel 2, 3 or 4. Once you’re in, there are three tiered progressive jackpots to play for — the Big, Huge and Mega Jackpots. The max win here can reach hundreds of thousands of pounds. 

Best Payout Slots Developers

Best payout slots are a huge attraction to many online gamblers, with a simple format and a wide range of innovative and exciting additions, bonuses and levels to climb on popular titles such as Starburst, Book of Dead, and Gonzo’s Quest. It’s a highly competitive market, with online gamblers expecting the best of the best in terms of graphics, gameplay, and new updates to classic favourites. 

But who are the developers behind these popular titles? Let’s take a look at some of the leading developers at the best payout slots sites.  

Play’n GO

Headquartered in Sweden, Play’n GO has been one of the leading gaming software providers since 2004, having originally been set up in 1997. Offering just over 500 games titles in total, including classic table games such as baccarat, and roulette, slots, video slots, and progressive jackpots. For the blackjack fans out there, Play’n GO is the provider for you, offering eight variations of the game.

Some of the high RTP slots produced by Play’n GO include:

  • Rage to Riches at 97.12% RTP
  • Piggy Bank at 97.03%
  • Ring the Bells at 97.03%

NextGen Slots

This Australian software provider was set up in 1999, and has, since 2011, offered its content via the NYX Interactive platform. This has helped expand the developer’s reach in terms of working with a huge variety of operators. Offering a smaller library than some of the other providers, with just over 100 titles in total, NextGen still has many of the favourites, covering just about every theme you can imagine across its slots collection.

In terms of high RTP slots by NextGen, there are those such as:

  • Starmania at 97.87% RTP
  • Gorilla Go Wilder at 97.07% RTP
  • Wild Plunder at 96.6% RTP

Big Time Gaming

Founded in 2011, Big Time Gaming is headquartered in Sydney, Australia. It’s best known for its fresh and innovative style of game production, with an outstanding level of graphics and creativity. Big Time Gaming offers a great range of slots, and has previously been awarded for its quality of work, such as in 2017 with the CasinoMeister award for Best iGaming Software Experience.

Some of its high RTP slots include:

  • Who Wants to be a Millionaire with an RTP of 96.24%
  • White Rabbit Megaways with 97.7% RTP
  • Starquest with 96.9% RTP

Pragmatic Play

Pragmatic Play was only founded in 2015, however its pace of expansion into a wide range of gambling areas has been remarkable. The company now leads the way with regards to game production, alongside breadth of gaming options and gambling expertise. Hosting a popular backlog of high RTP slots, Pragmatic never rests on its successes with a constant stream of new and innovative products being offered to customers.

A new game, Hot To Burn Extreme, launched in August 2022, but other high RTP slots include:

  • Wild West Gold with 96.51% RTP
  • The Catfather with 98.1% RTP
  • Da Vinci’s Treasure with 96.5% RTP 


IGT or International Gaming Technology has a long history of buyouts and renames, having originally been founded in 1975 as A-1 Supply. Continually looking at ways to expand its reach, IGT works at both land-based casinos and in the production of online slots and other gaming options for operators worldwide which includes table games, video poker, progressive jackpots, and of course many slots titles.

Some of its high RTP slots include:

  • Pixies in the Forest 2 with an RTP of 96.57%
  • Texas Tea with 97.36% RTP
  • 3-Reel Hold Up at 97% RTP


Headquartered in Stockholm, Sweden, and crowned RNG Casino Provider of the Year at the IGA Awards 2022, Yggdrasil has been disrupting the iGaming industry since its launch in 2013. The company serves as a game developer, content aggregator and platform provider, though it is perhaps best known by players for its innovative game mechanics such as SPLITZ and GIGABLOX. Yggdrasil offers a catalogue of over 180 slots and a small selection of table games. 

Some of the best paying slots in the Yggdrasil collection include:

  • Jokerizer at 98% RTP
  • Tut’s Twister at 97.10% RTP
  • 9K Yeti at 97% RTP


Founded in 2006, BetSoft is a Malta-based gaming provider with a portfolio of over 200 engaging online slot games. This company has long harboured a customer-first approach, packing its games with cinematic-style graphics, blistering soundtracks and immersive themes. Perhaps most impressive of all is the company’s Slots3 series, which includes must-try titles like the Fa-Fa Twins and Gladiator ToGo. 

High payout slots from BetSoft include: 

  • Good Girl, Bad Girl at 97.79%
  • After Night Falls at 97.27%
  • Lucky 7 at 97%


Established in 1999 and listed on the London Stock Exchange, Playtech is one of the world’s leading online gaming software suppliers. There are over 700 casino games in the Playtech catalogue, including original titles like Jackpot Giant and premium branded tie-ins such as Robocop and Justice League. Playtech is based in the Isle of Man and was named Slots Provider of the Year at the EGR B2B Awards 2022. 

Some of Playtech’s best payout slots include:

  • Goblin’s Cave at 99.32% RTP
  • Ugga Bugga at 99.07% RTP
  • Lotto Madness at 97.06% RTP

Bonuses at the Best Payout Slots Casinos

A great way to try out some of the best paying slots is with casino bonuses. New players can take advantage of a welcome bonus on their first deposit, or occasionally, without even making one at all. These are a great way to learn the rules and find a game you like, with bonuses such as free spins letting you practise before playing with real money. Here are the typical bonus options you’re likely to find at the best payout slots casinos.

Free Spins

Free spins are associated with slots games, and are regularly given in conjunction with other bonuses, such as matched deposits, which could read as, “50% up to £200, plus 50 free spins”. They’re also offered to existing players, as well as on their own as a welcome bonus. What’s great about accepting a free spins bonus is that it allows you to test out a game before playing it with any of your own money. Before accepting a free spins bonus, be sure to check that the games you want to play are included in the options list, as quite often free spins are targeted at specific titles.  

Matched Deposits

A matched deposit bonus is nearly always available at the best payout slots sites, usually as a welcome bonus as a percentage of 50% or 100%. Sometimes an operator will offer a 200% matched deposit but, as with all bonus offers, be sure to read the terms and conditions, as there will undoubtedly be wagering requirements or other stipulations regarding how you can use it, or access the winnings.  A matched deposit bonus may be written as, “100% up to £200” which means the bookies will match any deposit you make, but only up to a £200 limit. Anything you deposit over this amount will be void from the bonus. 

No Wagering Bonus

Wagering requirements are a regular occurrence alongside nearly every casino bonus you’ll ever find. They often mean that an initially appealing offer no longer works so favourably, with the need to wager your own money a certain amount of times before gaining access to the bonus winnings. However, you can sometimes come across no wagering bonuses which means you don’t have to trawl through the, often lengthy, wagering requirement process in order to withdraw your winnings. However, there will be other terms and conditions attached to your potential bonus win, such as max win limits, time limits, restrictions on the games you can play, as well as certain excluded deposit methods. 

No Deposit Bonus

A no deposit bonus allows new customers to technically play with free cash! It’s a great way of introducing a site, test out some high payout slots, and see if a casino review is speaking the truth. Ways in which you can access a no deposit bonus can be signing up to a casino site, or sometimes even just registering for a casino newsletter. Naturally, it’s great to be able to play without depositing a penny, however, be mindful that usual terms and conditions will apply, and there will be wagering requirements which are probably higher than usual – perhaps even around 50x the bonus value, meaning you have to wager 50 times the total bonus value before gaining access to any winnings. Despite this, we like to see no deposit bonuses as a way of testing the water and trying out something new. 


Cashback casino bonuses are great at softening the blow of a loss, with the casino player receiving a small percentage of their wager back when their bet hasn’t come off as they’d hoped it would. It’s never a huge amount, usually between 10-20% of your wager, and is rarely withdrawable, coming in the form of account credit. This means you can play again, or have a respin, without having to use more of your own real money. This type of bonus is regularly seen in a sportsbook section of an online gambling site, as well as within live casino games, so there are plenty of options to accept a cashback bonus. Be mindful of terms and conditions there aren’t likely to be any wagering requirements, however maximum winnings caps are normally present.

How We Recommend Casinos with the Best Payout Slots

We will only ever recommend the best payout slots that tick all the boxes. Through a rigorous casino review process, we can highlight the best online slots out there, the providers who present the top bonuses, and generally the best payout slots we think you’ll enjoy playing the most. So, while reading through our suggestions and reviews, you can rest assured we’ve done the leg work in finding the best online slots out there. Within these casino reviews, our team covers all the important areas of recommendation, such as:

  • UKGC Licence Most importantly, in our search for the best payout slots, we will only ever review or recommend sites that are licensed by the UK Gambling Commission;
  • Choice of Best Payout Slots The best sites are going to offer a broad range of titles, genres, and game types, so this is something we look for in our reviews;
  • Other Games It’s great to see some variety, for when perhaps you want to change up your game play or try something new. We like to see sites that offer more than just online slots. For example, a good range of table, and live dealer games should also make the cut;
  • Welcome Bonus The best online slots sites welcome their new customers with an exciting range of bonuses. We like to see bonuses that are generous, varied, and that extend into existing customer promotions;
  • User Experience and Site Design No one wants to spend a long time learning how to navigate a site, so for us the best payout slots sites are easy to parse, and have a clear site layout and design;
  • Customer Support At a basic level, we’d expect email support for when something isn’t quite right, however the best payouts slots sites also offer live chat, and a telephone customer support number if you’d prefer to speak to an advisor; 
  • Payment Methods Not everyone wants to pay with a debit card, so the best payout slots sites will offer customers a broad range of payment methods, such as e-wallets, prepaid cards, pay by mobile, and even cryptocurrencies.  

Compare the Top Online Casinos for the Best Payout Slots

Now that you’re up to speed, take a look at the table above for the best payout slot sites and bonuses available in the UK. Compare sites with the help of our impartial reviews, and click through to sign up to your best fit.

Frequently Asked Questions

  • Is it possible to go on a long losing streak with a best payout slot?

    Yes. RTP is calculated over millions of games so there’s no guarantee you’ll win. Lengthy losing streaks aren’t as likely with a less volatile or lower variance slot.

  • Can I win real money with an online casino slots bonus?

    Yes, but it depends on the offer. As always, T&Cs apply, and we’d recommend keeping an eye out for a deposit bonus with no wagering requirements. With the latter, any money you win can be withdrawn straight away.

  • What is the best slot for RTP?

    In 2022, Ugga Bugga and Mega Joker are two of the best payout slots online, with RTPs of 99%.

  • Which online slots have the highest payout percentage?

    Playtech’s Ugga Bugga has a high RTP of 99%, alongside NetEnt's Mega Joker. NetEnt's Jackpot 6000 and Thunderkick's Uncharted Seas also rank highly, RTPs of 98.8% and 98% respectively.

  • Why do online slot games have different RTPs?

    Payout percentages are based on the slot's mechanics. Providing variety by way of RTP allows developers to cater their games for players on different bankrolls. If all RTPs were the same, the games wouldn’t be nearly as diverse.

  • How do I know online slot machines aren’t rigged?

    Licensed casinos have their games assessed regularly by industry regulators such as eCOGRA. If a casino site is found to have manipulated the payouts on its games, it will face substantial fines and may possibly have its licence revoked.

  • Can I use bonus funds to play the highest paying slots?

    Almost all casinos restrict welcome bonuses such as bonus spins to a limited number of titles, which frequently omit progressive jackpot games and the top paying slots. You will, however, likely be able to use your spins on popular online slots with lower RTPs.

  • Which online slots pay out the most?

    The Vegas Strip may be beyond our reach but there’s no shortage of high RTP slots for UK players to choose from online. Some of the best paying slots include Playtech’s Ugga Bugga at 99.07%, NetEnt’s MegaJoker at 99% and Barcrest’s Ooh Aah Dracula, which also offers 99% RTP. Remember, that some high paying slots will require you to play the max bet to hit the highest payout percentages.

The people behind this page

Online gambling content experts helped write, edit and check this page:

Daniel is Head of Operations at Gambling Deals. Along with contributing content to the site as both a writer and editor, Daniel is responsible for the site's development across content and functionality, striving to ensure Gambling Deals is the premier location for gambling offer comparison. In his spare time Daniel is a keen photographer, basketball player, Premier League and NBA aficionado, and dedicated Liverpool fan.
Alice is a Content Editor at Gambling Deals and has a major hand in writing, editing, and planning the copy that ends up on the site. She's always on the lookout for new ways to bring the site to life, and regularly catches up with industry experts to get the latest on where things are heading. Outside work Alice plays lacrosse, knuckles down with French, and keeps close tabs on Arsenal FC.
James is a contributor at Gambling Deals focused on delivering his gambling industry expertise to our users in easy to understand and digestible copy. As well as writing guides, reviews, and recommendations, James supports the team with fine-tuning across the site to make sure we offer as much value as possible.
With several years experience in the online gambling industry, Guy is a Writer for Gambling Deals. Outside of work he loves sport, in particular football and cricket.

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